We do not have much modularity in our templates right now. There's no way to add new features to your template without just copying another template. This proposes we add a coder_agent_script resource that allows for parallel operations on start in a self-contained module.

resource "coder_agent_script" "code-server" {
    agent_id = coder_agent.dev.id
    name = "code-server"
    icon = "/icons/code.svg"
    script = <<EOF
        curl -fsSL https://code-server.dev/install.sh | sh
    EOF
}

We should add a lifecycle to this, but default to execute on start. This would run and appear in the logs UI in tabs for each script:

This allows us to provide aspects of the startup script as Terraform Modules. Enabling customers to add features to their workspaces:

module "code-server" {
  source  = "coder/code-server"
  version = "1.73.0"
  extensions = [
    // list extensions to be automatically installed on start
  ]
}

A module could provide parameters as well, enabling entirely self-contained modules that mutate an agent.